Approach for fatigue damage assessment of welded structure considering coupling effect between stress and corrosion |
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| Affiliation: | 1. Technical Center, Department of Oil and Gas, Bureau Veritas, Shanghai, China;2. School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian, China;1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;2. Engineering Technology Research Institute of Xinjiang Oilfield Company, Karamay 834000, China;3. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;4. Qingdao R&D Institute, Xian Jiaotong University, Qingdao 266300, China;5. Shanghai Hailong Oil Tubular Goods Research Institute, Shanghai 200949, China;1. National Centre of Advanced Tribology at Southampton (nCATS), Faculty of Engineering and the Environment, Highfield Campus, University of Southampton, SO17 1BJ, UK;2. Southampton Marine and Maritime Institute, Boldrewood Innovation Campus, University of Southampton, SO16 7QF, UK;1. Institute of Ocean Engineering and Ship Technology, Gdansk University of Technology, G. Narutowicza 11/12 st., 80-233 Gdansk, Poland;2. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal;3. Faculty of Civil and Environmental Engineering, Gdansk University of Technology, G. Narutowicza 11/12 st., 80-233 Gdansk, Poland |
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| Abstract: | This paper presents a new approach to assess time-dependent corrosion fatigue damage of welded joint considering the coupling effect between mechanical factor and corrosion factor. The high stress region around weld will accelerate corrosion and be more likely to induce nonuniform corrosion of welded joint. And the effect of loading on corrosion behavior of the steel in NaCl solution was investigated. The synergistic effect between applied elastic stress and chemical attack on Q235 steel was evaluated by electrochemical experiments. A side longitudinal of ship structure is selected as a case study. Time-dependent stress concentration factor of welded joint as a function of corrosion deterioration was analyzed, and the iterative process of stress and corrosion degeneration of plate thickness was used to simulate coupling effect basing on the results of experiment. The hot spot stress approach was adopted to calculate the fatigue damage. It is revealed that the nonuniform corrosion could influence fatigue damage of welded joint, and that impact will be more and more significant with the growth of corrosion year. |
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| Keywords: | Coupling effect Mechanochemical experiment Nonuniform corrosion Welded joint Hot spot stress Fatigue damage |
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